which of the following can be used to represent the period of series numbers of elements?
A. atomic number
B. mass number
C. number of occupied energy levels
D. number of valence electrons of the atoms
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which of the following can be used to represent the period of series numbers of elements?
A. atomic number
B. mass number
C. number of occupied energy levels
D. number of valence electrons of the atoms
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Answer:
a.atomic number
Explanation:
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